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From: mch@ukc.ac.uk (Martin Howe)
Newsgroups: comp.terminals
Subject: Re: Termcap (ansi) arrow key question
Summary: What Vi does
Keywords: DECCKM DECKPAM DECKPNM DEC VT100 ALPHATRONIC
Message-ID: <42@harrier.ukc.ac.uk>
Date: 2 Feb 89 11:26:30 GMT
References: <942@mcrware.UUCP> <9549@smoke.BRL.MIL>
Reply-To: mch@ukc.ac.uk (Martin Howe)
Organization: Lan/Micro Group, Comp. Lab, Univ. of Kent, CANTERBURY, UK
Lines: 30

In article <9549@smoke.BRL.MIL> gwyn@brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>) writes:
>In article <942@mcrware.UUCP> kim@mcrware.UUCP (Kim Kempf) writes:
>>Why is it that the termcap entry for most vt100-style terminals define
>>       [termcaps deleted]
>>Some other termcaps claiming ANSI terminal compatability are defined in this
>>latter method as expected.  I have an application that won't work because of
>>this problem.  Is this some type of special hack that 'vi' uses and other
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>>applications have to know about it, or what?  Thanks in advance.
>
>The former sequences are transmitted in ANSI (non-VT52) mode when
>the Cursor Key Mode (DECCKM) is Set and the latter when it is Reset.
>

Here at UKC, if you are using a VT100 in ANSI mode, vi sets DECCKM (see above)
when it starts up, and clears DECCKM when it exits. Having termcap defined for
              ===============================
DECCKM permanantly on, and Vi assuming so seems a funny way to do things.

Man (5) termcap should tell you how to set up your own private termcap file,
if you need to.

(BTW, A powered-up or reset VT100 has DECCKM and DECKPAM cleared, and this
cannot be changed in SET-UP).

Regards


-- 
Martin Howe                  (This posting is private, and NOT on behalf of UKC)